package org.learn.filter;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import java.io.IOException;

//@WebFilter(urlPatterns = "/*" )
public class DemoFilter implements Filter {
    @Override  //初始化方法，只调用一次
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init方法执行了");
    }

    @Override //拦截到请求之后调用，调用多次
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("拦截到了请求...放行前逻辑");
        filterChain.doFilter(servletRequest, servletResponse); //放行拦截
        System.out.println("拦截到了请求...放行后逻辑");//放行之后执行
    }

    @Override //销毁方法，只调用一次
    public void destroy() {
        System.out.println("destroy方法执行了");
    }
}
